1. The Catalyst suite version is the year and month it was released. ie October (10th month) 2004 driver suite is 4.10. There will be no 5.0 just like there was no 4.0 because there is no 0 month. This makes a lot of sense when you're releasing 12 sets a year on a monthly basis. This is not new people, try to catch up a year or two.
2. This driver set is actually older than the 8.07 hotfix and does not have the fix for cards with 256 megs of RAM nor a few other fixes. This may give you a decrease in performance if you own one of those cards. Unless you're having issues stick with the Omega drivers based on the 8.07 hotfix (or the ATI 8.07 if you prefer).
This comment was edited on Oct 15, 00:24.